How to Choose a Commercial Solar Company in Gauteng: What to Look For
A commercial solar system is a 25+ year asset. The company that designs and installs it determines whether that asset delivers consistent returns for decades or becomes a source of ongoing problems and disappointing performance. The difference between a good installer and a poor one is not always obvious from a quote.
This guide gives you the criteria that matter, the red flags to watch for, and the specific questions to ask before you sign anything. Use it as a checklist when evaluating any commercial solar company in Gauteng — including us.
The Credentials That Matter
South Africa's solar industry has grown rapidly, and not every company operating in the space has the same level of qualification or accountability. Here are the credentials worth verifying:
SAPVIA Membership
The South African Photovoltaic Industry Association (SAPVIA) is the national body representing the solar PV industry. Membership indicates a company is recognised within the industry and has committed to professional standards. It is not a guarantee of quality on its own, but the absence of any industry affiliation is worth questioning.
PV Green Card
The PV Green Card is a certification issued to individuals who have completed accredited training in the design and installation of photovoltaic systems. It is specific to solar — not a general electrical qualification. When a company holds PV Green Card certification, it means the people designing and overseeing your installation have solar-specific technical training, not just general electrical experience.
Registered with the relevant authorities
Your installer should be a registered electrical contractor. The installation must be signed off by a qualified person who can issue an electrical Certificate of Compliance (CoC). Without this, your system is not legally compliant, and your insurance may not cover it.
Product certifications
Ask about the specific panels and inverters being proposed. Are they Tier 1 panels? Are the inverters from established manufacturers with local service support? A reputable installer uses components backed by real manufacturer warranties and local support infrastructure — not grey-market imports with no recourse if something fails.
Commercial Experience vs Residential — Why It Matters
Many solar companies in Gauteng started in the residential market and have moved into commercial work as the market has grown. There is nothing inherently wrong with that, but commercial solar installation is a fundamentally different discipline.
What makes commercial different:
- System complexity. A 100kWp commercial system is not ten residential systems bolted together. The electrical design, inverter configuration, grid connection, and load management are significantly more complex.
- Structural considerations. Commercial roofs — IBR sheeting, concrete slabs, portal frame structures — each require different mounting approaches. Getting this wrong can cause roof leaks, structural damage, or warranty voidance.
- Electrical infrastructure. Commercial premises have three-phase power, larger distribution boards, existing generators, and more complex load profiles. The installer must understand commercial electrical systems, not just residential DB boards.
- Regulatory requirements. Municipal approvals, grid connection applications, and compliance requirements are more involved for commercial systems. An installer without commercial experience may not navigate these efficiently — or at all.
- Financial structuring. Commercial clients need detailed financial modelling, Section 12B documentation, PPA structuring, and asset finance coordination. This is not part of a residential installer's normal workflow.
How to verify commercial experience:
Ask for reference projects. Specifically, ask to see completed commercial installations of similar size to what you need. Ask for contact details of previous commercial clients you can speak to. Any reputable commercial installer will have a portfolio they are happy to share.
Questions to Ask Before You Sign
Before committing to any solar company, ask these questions and evaluate the answers carefully:
1. "Can I see examples of commercial installations you've completed?" Look for projects of similar scale to yours. Ask about system sizes, building types, and how long ago they were completed. Recent, relevant experience matters more than a long list of residential jobs.
2. "Who will design my system, and what are their qualifications?" The person designing a commercial solar system should have specific PV design qualifications — not just general electrical experience. Ask about their PV Green Card status and how many commercial systems they have designed.
3. "What does your proposal include — and what doesn't it?" A comprehensive proposal should cover everything: panels, inverters, mounting, cabling, installation labour, grid connection, commissioning, and monitoring setup. If the quote only covers "supply and install" without detailing what is included, ask for an itemised breakdown. Vague quotes lead to surprise costs later.
4. "How do you handle grid connection and municipal approvals?" This is a revealing question. An experienced commercial installer handles these as a standard part of the project. If the answer is vague or suggests you need to manage this yourself, it indicates limited commercial experience.
5. "What monitoring do you provide, and do you actively monitor after installation?" Any modern commercial system should include real-time monitoring. But the better question is whether the installer monitors your system on their end and responds proactively to performance issues — or whether they hand you a login and disappear.
6. "What happens if something goes wrong in year 3? Year 8? Year 12?" After-sales support is where many solar companies fall short. Ask specifically about their warranty process, response times, and whether they have a physical presence in Gauteng. A company based in another province or country will not provide the same level of support as one with a local team.
7. "Can I speak to a previous commercial client?" This is the most powerful question. Any company confident in their work will happily provide references. If they hesitate or redirect, that tells you something.
Red Flags to Watch For
The solar industry, like any growing market, has its share of operators who overpromise and underdeliver. Here are the warning signs:
Unrealistic savings projections. If a proposal promises 80-90% electricity savings without batteries, or claims a 2-year payback on a standard grid-tie system, the numbers are inflated. Realistic commercial savings are 40-60%, with payback periods of 3-5 years including Section 12B benefits. Be wary of anyone who tells you exactly what you want to hear.
No site visit before quoting. A company that provides a detailed quote based on a phone call or Google Earth image is guessing. Commercial system design requires a physical assessment of your roof structure, electrical infrastructure, shading, and cable routing. If they have not visited your site, they cannot design your system properly.
Pressure to sign immediately. "This price is only valid for 48 hours" or "we have limited stock" are sales tactics, not business practices. A reputable installer gives you a reasonable time to evaluate the proposal, consult your financial advisor, and make an informed decision.
Vague or missing warranties. Your proposal should clearly state the warranty terms for panels (typically 25 years performance), inverters (typically 5-10 years, extendable), mounting structures, and workmanship. If warranty details are absent or buried in fine print, ask for them in writing before proceeding.
No after-sales support plan. Ask what happens after commissioning. If the answer is essentially nothing — no monitoring, no maintenance offering, no ongoing relationship — you are on your own when something needs attention. Ongoing support matters.
The company does not exist in a year. The solar industry has seen companies start up, install aggressively, and then close when warranty claims start arriving. While you cannot predict the future, you can assess stability: How long has the company been operating? Is it owner-operated or a franchise? Does it have permanent staff and a physical address? Is it financially stable enough to honour long-term commitments?
Why Local Presence and Owner-Operation Matter
A commercial solar system is a long-term relationship, not a transaction. Over 25+ years, you will need your installer for:
- Annual inspections and maintenance
- Inverter replacements (at the 10-15 year mark)
- System monitoring and performance queries
- Potential system expansion as your business grows
- Warranty claims and troubleshooting
Local presence matters because response time matters. When your monitoring flags a fault, you need someone who can be on site quickly — not someone coordinating from another city. A Gauteng-based installer serving Gauteng businesses can respond same-day to most issues.
Owner-operation matters because accountability matters. When the person who designed your system, oversaw its installation, and signed off on the commissioning is the same person who answers the phone when you call — the incentive to get it right the first time is different. There is no buck to pass, no call centre to navigate, no "that was a different department."
This is not a criticism of larger companies. It is simply a recognition that in commercial solar, where systems are complex and relationships are long, knowing exactly who is responsible for your project has practical value.
Getting Multiple Quotes — How to Compare Properly
Getting two or three quotes is sensible. But comparing solar proposals is not as simple as looking at the bottom-line number. Here is how to compare meaningfully:
Compare system size and expected output, not just price. A cheaper quote might propose a smaller system that saves you less. Compare the cost per kWp (total price divided by system size in kWp) and the projected annual kWh generation.
Compare component quality. Are both proposals using Tier 1 panels? Are the inverters from the same tier of manufacturer? A lower quote using lesser-known brands may cost more in the long run through lower efficiency, shorter lifespans, or warranty issues.
Compare what is included. One quote might include monitoring, grid connection fees, and commissioning. Another might list these as extras. Get itemised breakdowns from each and compare like for like.
Compare the financial modelling. A thorough proposal includes a detailed savings projection with stated assumptions (tariff escalation rate, system degradation, consumption profile). If one proposal projects dramatically higher savings than another for the same system size, ask why. The assumptions may be unrealistic.
Compare after-sales support. What does each company offer after installation? Monitoring? Maintenance packages? Proactive performance management? The cheapest installation with no after-sales support is rarely the best value over 25 years.
Compare the people. You are entering a long-term relationship. Who will you deal with? Can you meet the person responsible for your project? Do you trust them to be around in five years?
Make the Right Decision, Not the Fastest One
Choosing a commercial solar installer is a decision that affects your business for decades. Take the time to evaluate properly:
- Get 2-3 quotes from companies with demonstrable commercial experience
- Verify credentials — SAPVIA membership, PV Green Card, registered electrical contractor
- Ask for and contact commercial references
- Compare proposals on a like-for-like basis, not just price
- Evaluate after-sales support, monitoring, and long-term commitment
- Meet the person who will be accountable for your project
The right installer delivers a system that performs as projected, lasts as warranted, and is backed by someone who answers the phone when you need them. The wrong installer costs you far more than the price difference between quotes.
If you would like to see how Gentricity approaches commercial solar — our credentials, our process, and our completed projects — we are happy to walk you through it during a free assessment. No obligation, no pressure. Just a transparent look at what we do and how we do it.
Get Your Free Assessment — or call Albert directly: (083) 287 5986
Gentricity is an owner-operated commercial solar installer based in Centurion, serving businesses across Gauteng. SAPVIA member. PV Green Card certified. See our completed projects or learn how we work.